The reagents used in the experiment process were commercially available and used directly. The metal ions salts employed are NaCl, KCl, CaCl2·2H2O, MgCl2·6H2O, CdCl2, HgCl2, FeCl3·6H2O, CrCl3·6H2O, Zn(NO3)2·6H2O, AgNO3, CoCl2·6H2O, MnCl2·4H2O, CuCl2·2H2O, NiCl2·6H2O, and PbCl2. The anions salts employed are NaClO, Na2SO4, NaNO3, Na2CO3, NaCl, NaAc, NaClO4, NaBr, KI, NaSCN, and Na2HPO4, respectively.
UV-vis absorption spectra and fluorescence emission spectra were recorded on Hitachi U-2910 spectrophotometer and Hitachi 4600 spectrofluorimeter at 25 °C with 1 cm quartz cell, respectively. Mass spectra were collected on a Thermo TSQ Quantum Access Agillent 1100 system. Nuclear magnetic resonance spectra were performed with a Bruker AV 400 instrument (400 MHz), and chemical shifts were given in ppm by using tetramethylsilane (TMS) as internal standards.
UV-vis absorption spectra and fluorescence emission spectra were recorded on Hitachi U-2910 spectrophotometer and Hitachi 4600 spectrofluorimeter at 25 °C with 1 cm quartz cell, respectively. Mass spectra were collected on a Thermo TSQ Quantum Access Agillent 1100 system. Nuclear magnetic resonance spectra were performed with a Bruker AV 400 instrument (400 MHz), and chemical shifts were given in ppm by using tetramethylsilane (TMS) as internal standards.